Hello Aspirant, this is not the platform where you asked these questions but don't worry I am giving you answer.

The concept of legitimacy also has acquired a significant place in modern political theory. Although the germs of this concept can be seen in the writings of Plato who enunciated the idea of justice in his Republic, yet its systematic exposition has been carried only by modern political thinkers.

Power, influence and authority can be effective only if they are legitimate. The role of coercion in political relations has diminished with the growth of culture and civilisation. Coercive power is now regarded primitive and brutal.

The modern political processes make use of non-coercive methods of control such as influence, persuasion, leadership, public opinion, etc.

I hope this will help you.